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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a203b168077ec6461c37a34f68d9a47681b1d00995a23a89c56ca96e7656c2f' 
  AND token = 'e7dKFB86j5jBr2ONVIydNRrEetaHtoH/yD5qID7s1Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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