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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd84619420f7fdda513d6984498face2c017e68f822d6a96124ad0acf5e9fce' 
  AND token = 'zdxCn1SHQ47z0QZORb3oRZCbqfKvtaYE+uLu3z4wQx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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