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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560db37b8a8c7b88b026a1652a1ef7ad01a0291a86d9b0c5c08ef40ca4d022b4' 
  AND token = 'MsWZwIhZ2LQ3sbn7BhvV3ZnNL9GFjxM436zK5CPTx8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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