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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '895f0b8d1e86eb8d0e00e912466d1114ad2854ed35bd5d4d785bc7a0e030a635' 
  AND token = '8jqdGrXhePULlzz05twvuobX2DkH8nC+f5+0Bc7eHbQ=' 
  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"
    }
  }
}