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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ded4eff114b73acf589259e6be41bb5d86e8a879a85da8c9f95ec7d7a30a55' 
  AND token = '+nAgCE3J+zjrOUBEksg2tUnI9I8lu6Poy7BS+lqMaHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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