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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88fad5eebc6829254d4d6e44e512506c38f84c31156a11b67dd3fd602c96b48' 
  AND token = '80Xd0Sp5UMzQK0NGdZl+Pw8kwGKjzYeotGRyt5lzb6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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