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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33c5c873db4be57c15fe40deafdcd5ebc1f8bc87bc0f0cdbc9bf9b92603fc4f' 
  AND token = 'S//FBoSQspt8Hfwxo19CJWuUnNEn+YpUAdoj3aXcJXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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