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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca74e864542f8785fc2968e0c017d003ae4b09257fb220151d37237b3d3ff73e' 
  AND token = 'qyUz5X6VXaTlo4tpJzOrO1BzW8N8G/CRLF7eT2wS2pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}