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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac11f6be2b537959f90a0456a08adc6d4e8c53b79ab5efc164231ab4bf8fd067' 
  AND token = 'usjrmn24eSedStlTM39LLhaPVXLZlt1maJYaHCdv33E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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