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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eeee79d29434f548930829e5f70825f8e898cf1fc2f1478c8d136fef75fc7e8' 
  AND token = 'EemUeHL3gi8a+lkjaEXm4dMq0LkTLLOUgXhmJ5RKfno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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