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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80535299e462346713fbabdb59eb4864fe6a6d7bdac5fe94673ca48d2887fc24' 
  AND token = '09EZwelixRRwMPYGq8W8AAhf3NT1L3ICSyedXB9ojGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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