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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13ffa8f2240eb44b3d68c094bd72be5a89c60dde8ef9fd7fcf0b5899da63f69' 
  AND token = 'hhOWLaQ/Qg8TeWxZs5LYdcq5QSda0zazkuecoipmxao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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