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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '622b5b17310e3cda20a875e2604591dc8c7b4e8116f8c9c7df2e625f4e4e18d6' 
  AND token = 'W7Bb7veXeo2t2W7L3Drgqw97mrwznfKlGEfpbM80MkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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