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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675af1e2c7b27223ba3af26da55d55177eaa32e8039fc3a719af5c0d279d1076' 
  AND token = 'tam3qByjG4leHSxEY+ysLOLvdW+yM2EguaO6lz0pfK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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