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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db214bd19034050f1138e93b5bd71ca619aa8d4ced5ea32d7942c09a856779a' 
  AND token = 'dl4C2yzCAwAS3qBo1v9xuI/Sii9wap7J/G0fcXDrnm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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