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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c79cf594ba9b38215f67e7a9d96fea174d18a5e0acfd040564f1a570f1d7f4a' 
  AND token = 'n4GHcHOyqST3HNetxwF+TTrZxRDfeW+jjOt1B+L2wOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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