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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38c110a080ab7c509b5e7eb8d09444548088070c73983ff93bb598c5249a949' 
  AND token = 'B+GUGqr7D3vcE2Lbvm48I8hUe4DUn8VSY3sMqsOH6Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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