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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925554cdd0e563e2505bd55eabf83ef7d1ef364dacd5f23e752d11be8e680f89' 
  AND token = 'S6f+NTT1WNKc6jOq4upmXQe3YmKJTkk2hgxG4J2htG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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