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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7f5aff744d54762c750218aa0cb7d716583004ddb4e3e228007f3fd06624c7' 
  AND token = 'j/Q5LC7j0MkJP2107wpFrKYNhsd18tE7O4yxle1Wphs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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