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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a5e771176e76a59f3a91f6fce5803082f42c4360f80a252323546cefc4b29b2' 
  AND token = '/v98AX7ZlrkUAnuY5nBEt/T2gNkjMESV5j3h9wdQxok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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