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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7cbb451d2f2ea89aa7e04d7a1589300ca0ca08d636f30915576a20ebfc3db96' 
  AND token = 'Idctd+YbXUjY117HeZPkXECGR93N/xd5kzMK4VP0Eag=' 
  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"
    }
  }
}