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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac2586160f949481c35e93c41f4d7e98ff8fd25a253025c2b3950cae43cafd6' 
  AND token = 'uAFc0ILFWpciNLhsLj+dz3WNhjI/FyP+2K6H/b8yeG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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