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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29146eaa4dab14df5385ce725475e3279899b414d13bea33c9aba91e5498238' 
  AND token = 'xQp0u9hVaeJKoEU/8F7b/1yAlfd1XWqjxzIS3KhsbWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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