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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f245b6165be630a173cbfe847d0df673a8a4d7be1086ccd010990b14a2b062c' 
  AND token = 'xDctBknD63HD0qbI5CKRCMc8Q/YSrAjkn0ZOgPjJWns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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