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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68de2a67041fb940461577e93ee7e1d7a7eed8aea82185f5b5dfc3d4ada4ba73' 
  AND token = 'lgfJd6oqGUhSbWg0dza4naqSYals9UM2Gi6CMjXx92k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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