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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c690d9b81054bd1dff33865069e4fdbce718c55e0a2062c3ae8a1dcd9bc067' 
  AND token = '1NXzvYKyxljabIcWouCvb5joCWrVnBueXeTjmPSkQ5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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