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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2b3e5859a92e84155027281981b0107e8cc3fa75d576c4ebc0d8ee1ec0ae4a' 
  AND token = 'L0Y+7f5gYXpi1A0RcbILPSoqzAjafiiIBghpYcgQ0t8=' 
  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"
    }
  }
}