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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc0074775a7b0b01ee4472398550fcc10dc9a5bbba19bd4eb47771410f45100' 
  AND token = '0MBno0fNgr9NKQFLFEU38APccZIW46YQSEvKcp+HCOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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