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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23360b63355f35144c6c114466b92e512bac1833fb531109f2fae34ecc935b21' 
  AND token = 'Kzmn3qb0NZkauK1S0eZnB5FWJ/i3C24IpxQe2YzbJjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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