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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e51df10415dff0e879be2816f329f0b2183b93b46c90f2b1e22fa3818604e8' 
  AND token = '1RUH8LToumB3APmxCdC8mXxlCknghtsBGXgL8RpMjHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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