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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b6c87816950cd706ad5ffdd45c4b637d076c5a07771c293393db002a150df8' 
  AND token = '+kp6kI186A5JYYQQBX+AlgDQrbLTYH8DPiSLOmiMv0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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