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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c86a18607b94c378fbec6a4e27c39386cf06fdcb7ded7e6b4a00bfff7ad4778' 
  AND token = 'NFD1J0xM1WJd/rOZlcLP0Kwf4ikpK3hh65EeKq/6TbI=' 
  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"
    }
  }
}