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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d31a2b7b9e94075d43c3b3e53878f2d3d3ef5ab6e84b901125d72233cfe7576' 
  AND token = 'E8IDnSCFTpi4sKyT/mU0Pv/rh8p3TTPl43yf/PP7Ndk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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