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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34908b8b341a07a668b7b0bdb592fd1e5230f9c6b1ed1033af685c84d17b3529' 
  AND token = 'BvolKDj3eW6zArKf/ZEI5drcW46TVtk0ZkozY2InZGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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