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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98030a6de43c47e3f0135bb24ac2852bb77bf2c5f885663f3b2f3188d519be7' 
  AND token = 'TzYAsFfakHofIyO1CY24/ON5xEc5/K348sCN3zaO1mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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