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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e92d7ac00b9f53a7b5952072deb44e26744e7cc087c2afa2dc719977c1fd025' 
  AND token = '1+j4brUNDH/VRUYbUg0axsN8+vstemislQLB4WpDFQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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