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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47dbaf68564b03680589c8aed4c2d6db0d6304d64de8a387d25545c9061c5c5b' 
  AND token = 'HvigP23b+kg2YBKsv5KPEhs+sN5Fh9vlIZFeuZQmwsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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