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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6635ca07d9ab4c99049e1088bd09c8e9825f6bfc9e27280c182b671440f17bde' 
  AND token = '6pp/CZQsrD4wmRErlr5vQ7RpRD3T9YwAsWsM1YzQQUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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