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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f247922363bca44e239bafd4f4ca19c5c31148a453bdeb64424a7038f68995e3' 
  AND token = 'ffj9YgUetF/MJeYwHKbe0WjDw6n25p1Lm6epReR7/Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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