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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e630dd6b6b6b3884b92560d81058951ad356d196a3482378ac80c0d49c1559df' 
  AND token = 'xIW+B3j3wI9OP/QdXr9yVYAUeqAyOOI82nqguRnsm3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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