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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9cfd43ba1be5ba00e8dc6efa086c54e6f5fa05f5c7fecc147bab57c65a228b2' 
  AND token = '/sys5tH467ZxyS1ee0SUdNKQZRomeK06iIP5p7S8gDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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