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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035d58b0e5e55acf44fbcbc51b9be55699798a1e54ff010295f1b20ac5094129' 
  AND token = '59RnGvz2+oxOEB+yzShGxlltn7Vdf+I40B6UemPeRAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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