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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80ec8bdcea5cd5761feb3ae9c10527e2a640472bc86c68ec957a5b6d4855d945' 
  AND token = 'nNi5cWDvoSv6DQ54KiJP8pW7sUqpVGXUo2XiBlRv0sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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