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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29bf5c9086607d15ec7cc414f6c410506b4126c1ace81b6bae56b8c2b0dd046' 
  AND token = '4F4ZvLyW+zmr97WI1Q3t15bAI97AMX3KCAlpfQv0WzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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