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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e00836b2546096da30b36a1c796e4bf3d9c9f749cbd7d8a698e61a3e21e218bd' 
  AND token = '7Ya+1yqd1xAmVZLftKcK8Q1S06QWBAi1kCmAjCOmHjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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