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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91a261c7f8a65d9806480c095ab05587b306ea9b347ffd01125d894260b57e2' 
  AND token = '1cQKsyosN/YO/ktb1vzG5qMDgVhSiMM8ZZiDvNM9CAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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