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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b42d5b0a03e83b018223ebb96185e8893651a0144e04f904d36848730b316a' 
  AND token = 'gv7bwIRt/X34G6o7bDH9KjUGQO7yU8R9LOC+njEcrzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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