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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf1e3c48a9589d465e88be91b41f3d79dc0accb6b4e34daceacfd72893ef883' 
  AND token = 'n78P1SeMMZG1rHF9SBL6qk5Eh1BpkaLNqbaEQ+mOr4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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