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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98451f74c163f6848282da4956b44aec1e5416e5678613b5819949905247e18a' 
  AND token = 'GD/ekSToELoAgeswxS2AM0fxwLTsl6Njge7mr3vpV54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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