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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176d9907bd76d7fd5533f3ca3ba0433a24e7ec0b4bb7f1b56c95214b0f7eed58' 
  AND token = 'uz+bCp2WxZdWzqCmmh0AhNp/W/xEWyxroLvqherkjUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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