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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae9ad482826e861561bd9549ce13c962ba8d7f52390c97042f7b6e018cfe05c' 
  AND token = 'XDo9CxMHs9xK54rTpnVIfg7LnDWQql/fFm8c/K5QogI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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