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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01675b1c77eb3db23038678d009fa3db3c7dee1ae5cfb4b265c24dfeb8aa8ca' 
  AND token = 'a2UDfs+MzMklHAQLmpngwYD0q1hI0//Uw717/mRS5hw=' 
  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"
    }
  }
}