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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f4807e167c19987944d1f6d9f6fe470cb6e6986c0c24468f7ff4b5943c5010' 
  AND token = 'bA/woJjo4ra1IZgd+uz59ZpzMdAVfabRYlCrLLQH5a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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