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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b51faac7838b2be1f5ce3e6fb52e64363d3f987f5b46b2e0df2c37abb5d1b36' 
  AND token = '4+eod6jOSGEl304dciyeBj5u6+zH8tW7Ca4w52/w9/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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