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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74025fc04d8de798e743bae8c759283f73b4b1b41bd78fe2108b85412d9758a' 
  AND token = 'cdA3z92b0887eHxUwIz82bKZi0XVWUEu5rRIF46TLoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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