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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03614d575f7af9b7ab93e8fe3ae213aac184389c4c6ccb0db7e4a6b315468110' 
  AND token = 'LrQ+Tfb/52EZygQp+Kc5IQOmyE8cnsdUasfgcva4HMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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