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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8857092acc607d6e0c08ef034889c61162f8883fff4fc1ae7ec1518ae13ca22f' 
  AND token = 'kJmio4EFM9lJG6vxmL5MrM8nqO9Seo+mI2UJnmitDBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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