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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff0c1ca17d2745397c343f0341a96454c71c83525feb890ca20b996c33f25cc' 
  AND token = 'fghkgozgyGkzeYR1KA2I7/aIBC4axZ0XOPFQTiffZjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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