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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9aad4a12dfd46a4c644bf4f9014268b24185b9d508e6b0ece44c460c74fdede' 
  AND token = 'ycp2OYzymOQ0pQelsV0RyrWAgg0Tk2CJ8pe9xnyEGRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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