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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f63cb0010caaa92f85008ab5b9262a38d09bc4a5107e38a018870f38788b74' 
  AND token = 'bXScyXySnlWeotPlPgKvr4L5OFNawqhyUlqQGshoy5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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