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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de715982d82986c40beacecad93df2bc1819f9df235946fefeb85ec2526474e' 
  AND token = 'ig9BrTlBbKnIzPhnb5V0+4blT9nZclG2khR14iB1zOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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