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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71de820362cd89cb9cfb236638db32abb6ef5a9ebe82e7ac10dcb7bb6d07e47f' 
  AND token = 'J09nWD2SwtbsZ30Df1BXhXERrAL30FqTJWup3lAOxTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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